Fill in PlatformPrivateFootprint on Linux

base/process/process_metrics_linux.cc

Index: base/process/process_metrics_linux.cc
diff --git a/base/process/process_metrics_linux.cc b/base/process/process_metrics_linux.cc
index ba0dfa76b96f921e32df3ac97e1f54b44f25046f..3617710fa290fc0a5e4abe26e1a868957f15af6d 100644
--- a/base/process/process_metrics_linux.cc
+++ b/base/process/process_metrics_linux.cc
@@ -294,6 +294,20 @@ bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {
 }
 
 #if defined(OS_LINUX)
+
+uint64_t ProcessMetrics::GetVmSwapBytes() const {
+  return ReadProcStatusAndGetFieldAsSizeT(process_, "VmSwap") * 1024;
+}
+
+uint64_t ProcessMetrics::GetRssAnonBytes() const {
+  size_t private_bytes;
+  size_t shared_bytes;
+  bool ret = GetMemoryBytes(&private_bytes, &shared_bytes);
+  if (!ret)
+    return 0;
+  return private_bytes;
+}
+
 int ProcessMetrics::GetOpenFdCount() const {
   // Use /proc/<pid>/fd to count the number of entries there.
   FilePath fd_path = internal::GetProcPidDir(process_).Append("fd");